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## Homework Statement

A ray of light is incident in water on a plane water-glass boundary. The angle of incidence is 30 degrees. Calculate the angle of refraction. (Refractive index of glass with respect to air =3/2, refractive index of water with respect to air = 4/3).

## Homework Equations

n1sini = n2sinr

## The Attempt at a Solution

I tried approaching it with several methods, but I am puzzled. How do you get the glass to water refractive index from the data given??

Any help would be greatly appreciated. Thank you!